Ahh sweet, that's just the kinda answer I was after!
Will probably just give the throttle body a good clean up, replace the gasket and leave it as is, don't really want to spend on a catch can for the shitty old 1GFE haha. Might just chuck a little inline filter like this in there, see if it makes a difference
What is the purpose of that particular bolt on the rocker cover? I also notice it's a little wet around the oil cap, so probably got a leaky oil cap seal too. Might pull the rocker cover off, give it a clean up and maybe a coat of silver/black paint.. whatever i've got lying around I guess, replace the main gasket and little seals etc and see how we go. Trying not to spend too much on this motor since i'll be replacing it with something better sometime... but want to keep it reliable and running nicely in the meantime.
On another note, when I start the engine from cold, the oil pressure light stays on for 1-2 seconds before it goes off. Oil level is fine (though it's a bit old, will be giving it a good service this weekend), but is this considered normal/okay? I'm used to my 4G63, which builds normal pressure within about 3 cranks (i.e. the light goes out before the engine even starts).